Finding the Fourth Proportional to 12,816.77, 17,688.89 and 7,513.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.77 : 17,688.89 = 7,513.70 : x
2. Step 2: Convert to fraction form
   12,816.77/17,688.89 = 7,513.70/x
3. Step 3: Cross multiply
   12,816.77x = 17,688.89 × 7,513.70
4. Step 4: Simplify right side
   12,816.77x = 132,909,012.79
5. Step 5: Solve for x
   x = 132,909,012.79/12,816.77
6. Step 6: Final answer
   x = 10,369.93